debian7配置iptables

vim /etc/iptables.rule

文件内容如下

*filter

# Allows all loopback (lo0) traffic and drop all traffic to 127/8 that doesn't use lo0
-A INPUT -i lo -j ACCEPT
-A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT

# Accepts all established inbound connections
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

# Allows all outbound traffic
# You could modify this to only allow certain traffic
-A OUTPUT -j ACCEPT

# Allows HTTP and HTTPS connections from anywhere (the normal ports for websites)
-A INPUT -p tcp --dport 80 -j ACCEPT
-A INPUT -p tcp --dport 443 -j ACCEPT

# Allows SSH connections for script kiddies
# THE -dport NUMBER IS THE SAME ONE YOU SET UP IN THE SSHD_CONFIG FILE
-A INPUT -p tcp -m state --state NEW --dport 22 -j ACCEPT

# Allow ping
-A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT

# log iptables denied calls (access via 'dmesg' command)
-A INPUT -m limit --limit 5/min -j LOG --log-prefix "iptables denied: " --log-level 7

# Reject all other inbound - default deny unless explicitly allowed policy:
-A INPUT -j REJECT
-A FORWARD -j REJECT

COMMIT

测试这个脚本，iptables-restore < /etc/iptables.rule

如果发现iptables-restore v1.x.x: no command specified的错误，就把上面的脚本里面的空行全部删除，然后再重新回车添加

建立开机启动，vim /etc/init.d/start-iptables

#! /bin/sh
### BEGIN INIT INFO
# Provides:                    custom iptables
# Required-Start:
# Required-Stop:
# Default-Start:            S
# Default-Stop:
## Short-Description:        custom iptables
### END INIT INFO

/sbin/iptables-restore < /etc/iptables.rule

chmod +x /etc/init.d/start-iptables设置执行权限

rcconf添加这个脚本开机启动